For the basics, such as spelling and grammar issues, why don't you try writing it in MS Word first and using the suggested corrections? As for actual format and planning, yes you should give that some thought yourself- that's pretty much what differentiates between writing
. If you do that, I think your story has the potential to be a good one
PS In the meantime, practice just writing random stories. Focus on the very basic things until you get better at them, and then start shaping your style.
PPS Don't be offended by my and other people's comments. It's like Fallstel said, part of the reason for the Creative Writing forum is to give constructive criticism in order to help people improve. Just helping out- one writer to another